Philip Kwon, an Attorney at the Port Authority, Helped to Prepare Bill Baroni

An attorney with close ties to Gov. Chris Christie's administration helped prepare an official who gave now-discredited testimony that lane closures at the George Washington Bridge were part of a traffic study, officials said.

Philip Kwon, a top attorney at the Port Authority of New York and New Jersey, spent parts of four to five days helping to prepare Bill Baroni, then the authority's deputy executive director and its top executive appointment by Mr. Christie, before he spoke to a New Jersey legislative committee on Nov....